2020 11 17 ReactJs GetFile Objects 4 Constructor Function Stacks смотреть онлайн

17th November, 2020,
GetImage, GetYoutube, GetFile

var obj = {};

Construction Function.
function A() {
this.name = 'John';
}
var obj = new A();

obj.name;
'John'

Benefit of using constructor functions is that they accept the parameters, which can be used when creating new object.
function A(f, l) {
this.firstName = f;
this.lastName = l;
this.whoAreYou = function() {
return 'I am ' + this.firstName + ' ' + this.lastName;
}
}
var o1 = new A('John', 'Doe');
var o2 = new A('Hello', 'World');

var o3 = A('trump', 'donald');
o3 is a normal function call and it will not create a object.
and any this inside o3 call will be attached to the global object.

Array Utilities:
// arr.push(rec); this will add element at the end of the array.
// arr.unshift(rec); this will add element at the beginning of the array.
// arr.pop(); this will remove the element from the end of the array.
// arr.shift(); this will remove element from the beginning of the array.

Queue and Stacks in Datastructure;

Stacks:
one book on table, second book above the first one, tenth will be on the top
FILO - First In, Last Out.

Browser History:
yahoo.com, google.com, facebook.com, instagram.com, twitter.com.

['book1', 'book2', 'book3', 'book4', 'book5']

function Stack() {
this.data = [];

this.insert = function(val) {
this.data.push(val);
}

this.remove = function() {
return this.data.pop();
}

this.size = function() {
return this.data.length;
}

this.peek = function() {
return this.data[this.data.length - 1];
}
}

var obj = new Stack();
obj.insert('book1');
obj.insert('book2');
obj.insert('book3');
obj.insert('book4');
obj.insert('book5');

My Website,